<template>
	<view>
    <!-- 自定义搜索组件 -->
    <my-search @click="gotoSearch"></my-search>
    <!-- 商品分类 -->
		<view class="scroll-view-container">
      <!-- 左侧 -->
		  <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item,index) in cateList" :key="index" >
          <!-- 标题 -->
          <view @click="activeClick(index)" :class="['left-scroll-view-item', index === active ? 'active' : '']">
            {{item.cat_name}}
          </view>
        </block>
      </scroll-view> 
      <!-- 右侧 -->
      <scroll-view class="right-scroll-view" scroll-y="true" :scroll-top="scrollTop" :style="{height: wh + 'px'}">
        <view class="cate-lv2" v-for="(item2,index2) in cateLevel2" :key="index2">
          <!-- 标题 -->
          <view class="cate-lv2-title">
            / {{item2.cat_name}} /
          </view>
          <!-- 三级分类 -->
          <view class="cate-lv3-list">
            <view @click="gotoGoodsList(item3)" class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3">
              <!-- 图片 -->
              <image :src="item3.cat_icon" mode=""></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>  
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
        // 当前设备可用高度
				wh:0,
        // 分类数据列表
        cateList:[],
        // 二级列表
        cateLevel2:[],
        // 激活项
        active:0,
        // 滚动条距离顶部距离
        scrollTop: 0
			};
		},
    onLoad() {
      // 动态获取当前设备的信息getSystemInfoSync
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      // 调用方法 获取分类数据列表
      this.getCateList()
    },
    methods: {
      // 获取分类列表项
      async getCateList() {
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        // console.log(res)
        if(res.meta.status !== 200) return uin.$showMsg()
        // 分类数据列表
        this.cateList = res.message
        // 二级数据列表
        this.cateLevel2 = res.message[0].children
      },
      // 分类列表点击
      activeClick(index) {
        this.active = index
        this.cateLevel2 = this.cateList[index].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      // 点击三级商品分类跳转
      gotoGoodsList(item) {
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      // 点击搜索
      gotoSearch() {
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
	}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  
  .left-scroll-view {
    width: 120px;
    
    .left-scroll-view-item {
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active {
        background-color: #fff;
        position: relative;
        
        &::before {
          position: absolute;
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;
  
  .cate-lv3-item {
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    
    image {
      width: 60px;
      height: 60px;
    }
    
    text {
      font-size: 12px;
    }
  }
}
</style>
